Elevator dispatching system



Jam 23, 1945- H. w. WILLIAMS ET Al. 2,367,988

ELEVATOR DI SPATCHING SYSTEM Filed Jan. 14, 1942 1 5 .Sheets-Sheet 1 ATT NEY Jan 23v 1945. H. w. WILLIAMS ET AL 2,357,983

ELEVATOR DISPATCHING' SYSTEM Filed Jan. 14, 1942 5 Sheets-Sheet 2 Jan- 23. 1945 H. w. WILLIAMS ET AL l 2,367,988

ELEVATOR DISPATCHING SYSTEM Filed Jan. 14, 1942 5 Sheets-Sme?l 4 INVENTORS H. W. WILLIAMS ETAL ELEVATOR DISPATCHING SYSTEM Filed Jan. 14, 1942 5 Sheets-Sheet 5 M.. vvd X51 m Qvx Jan. 23, 1945.

Patented Jan. 23, 1945 2,367,983 Y ELEVATOR msP'romNG SYSTEM Harold W. Williams, Nutley, Mark L. Mount, Westfield, and Arvid M. Nelson, Jersey City, N. J., assignors to Westinghouse Electric Elevator Company, Jersey City, N. J., a corpora- ;tion of Illinois Application I.mmm-y 14, 1942, serial No. 426,678

1`1 Claims.

Our .invention relates to elevator dispatching systems and .more particularly to dispatching systems for giving Vstarting signals at a single terminal .in :two car installations.

One .object is to provide ya two car dispatching system which shall have a small number of parts and yshall be simple and inexpensive'to install,A operate and maintain in operation.

Another object is to provide a dispatching system vwhich will keep the cars well spaced apart at all times where ya system lembodying a deiinite timing 4interval would tend to keep the cars operating close tog-ether on heavy traffic and to operate too often in light tramo.

A further object is toprovide a dispatching system without .a motor driven timing mechanism which will cause the cars to serve the waiting passengers effectively.

It is .also an object of our invention to provide a dispatching system for two car single installations ifn Awhich the time a :car remains at the Vdispatching floor will depend 'upon vthe amount of .tra'ic and the :position :of the other `car rather than upon :a ydeiinite time interval.

`For a better understan-ding of our invention lreference may :be .had to the accompanying drawings l.in which:

Fig-ure 1 vis a diagrammatic `representa-tion of an "elevator system embodying `our invention;

Fig. 22 represents the arrangement of the con- :tact A'segments and brushes pertaining to our in'- vention ion Vone rof the iloor selectors in 1;

'Figs i3 rand 4 embody .fa lstraight fline representation fof they/firing circuits yfor our improved Idispatching system as applied to fa `full automatic control system; and

Figs. `3A and 4Afa're `key representations of the relays embodied 'in Fig. '3, illustrating 'the coi-ls and Contact members disposed in horizontal alignment with .their positionsin the mstraight line circuit, so lthat their' locations therein :may .be readily determined.

'Our invention is yillustrated as `applied to 4'af-ull automatic control'system similar to that 4illustrated 'and described iin Patent No. 2,057,492: dated Cctober 1'3, i936, .on 'Signal and :control system for elevators. In :the system of the patent the cars may be 'started the operation Aof 'car switchesldisposed inthe carsfand may 'be stopped automatically lat the various floors served by the registration =of fstop calls ron push vbuttons in the vcars and fat the floor landings. However, `the system here illustrated does not, for 'the sa'ke of clear-ness, embody allthe renem'ents of the system shown in 'the patent, ybut Vit will bev under- Armenian stood that the invention may 'be easily applied to it and to many other types of elevator control systems. y

Referring more particularly to the drawings, we have illustrated an elevator `system embodying two cars A and Bdisposed for operation in suit-j able hatchways represented by the wall sections I0 for serving six floors. vCar A and Yits control parts will be described in .connection with reference characters and the similar ,parts for car VB will `be given the same reference characters with the prex B.

List of relays `individual to .car A:

car :selecting `relay up preference :relay down preference relay auxiliary direction relay call above relay lower terminal krelay top terminal relay K door relay NL next lamp Sl.. lstar-t lamp U Aup direction switch 'D down direction switch (oar B has the same parts designated by Bl Relays and buttons common .to both cars:

SUR up call registering relay for -fth floor SDR, down call'register'ing relay for Afifth floor v5UW 'up :push button at fifth lfloor '513W `clown 'push button .at fth floor (The other floors have 'the same arrangement of hall .relays and push buttons.)

. The car A .may be suitably `suspended in 'its hatchway'by a cable I l which passes over a hoist- 'ing drum I2 to a counterweight I3.

,A car switch CS is mounted vin car A for use by the .attendant Vin starting and stopping the car. Inasmuch vas car switches `and their control connections are old and well known inthe art, ,no ,further description .thereof will .be given.

.An ,up direction .relay switch U and a down direction relay switch D are .connected in circuit with the contact points of thev car switch CS. Movement of the :car switch in counterclockwise direction will energize the Vup direction switch U to cause upoperation oftheecarand kmovement oi .the car switch .in `clockwise `direction will lenerigize the down. direction switch to v.cause down operation of the car. Centering the ca-r switch will lstop 'the car. However, .it-will be `understood that .usually car buttons are disposed :iin the car and hall push buttons are mounted at the landings for giving stop signals or actuating the stopping mechanism (not shown) to cause the car to stop.

Suitable stop buttons I4, one for each oor intermediate the lower and upper terminals, are mounted in car A to be operated by the attendant therein when he wants the car to stop at selected iloors. Inasmuch as car buttons and their control circuits used in connection with the direction switches are well known in the art, no further description thereof will be given.

An up stop button and a down stop button are provided at each intermediate floor, with a down button at the top floor, in order that the Waiting passengers at the floor landings may register stop'calls to cause the cars to stop for them. The stop buttons at the Iiloor landings are cornmon to both cars and are designated as 2UW,

SUW, 4UW and SUW for the up direction and` f ZDW, 3DW, 4DW, SDW and SDW for the down direction. It will be assumed that the terminals will be provided with the usual limit switches to automatically stop the cars as they approach and that the ilrst oor Will be the dispatching door with the cars parked thereat when they arenot answering calls. Therefore, no "up or down" buttons for the rst floor and no up" button for the sixth iloor are provided.

Associated with the oor push buttons 2UW,

IDW, etc., are stop call registering relays 2UR, 3UR, 4UR and SUR. for the up direction, and BDR, SDR, 4DR, 3DR and 2DR for the down direction, so that the momentary pressing of a button at a floor will effect the registration of a stop call. Inasmuch as stop call registering relays and the stopping or signal systems controlled thereby are old and well known, no further description thereoi will be given. However, if desired, further details thereof may be secured from the above-named Patent No. 2,057,492.

A cancellation coil is associated with each call registering relay for the purpose of deenergizing and restoring that relay when the call thereon is answered. The cancellation coils are designated as ZURN, SURN, IURN and BURN for the up direction, and as BDRN, EDRN, 4DRN, 3DRN and ZDRN for the down direction.

A floor lantern FL is provided at the ilrst floor landing for car A to indicate to waiting passengers when that car is ready for an up trip. Additional door lanterns may be provided for the other iloors, but they are not shown as they are not involved in our invention.

A door relay K controlled by the door contacts I5 is provided for extinguishing the floor lantern FL when the door (not shown) for car A is closed as that car leaves on a trip and also for controlling certain other relays.

A next signal device, such as a lamp NL, is disposed in car A to warn the attendant therein to get ready for a start" or dispatching signal to start a trip.

A start or dispatching signal device, such as a starting lamp SL, is mounted in car A so that the attendant therein may be given a dispatching signal to start on a trip he has received a "next" signal to get ready for a trip.

A car selecting relayP is provided for car A for preparing the circuits of the floor lantern,

the next lamp and the start lamp of that car for operation when that car is parked at the dispatching door.

A call-above relay C responsive to operations of the call registering relays is associated With car A for assisting in controlling the operation of the dispatching signal means when stop calls are registered.

A lower terminal relay L is associated with car A and is responsive to the position of that car at the dispatching floor for assisting in controlling the dispatching signals. A top terminal relay T controlled by the arrival of the car at the top is provided for controlling a direction relay for car A.

An up direction preference relay X and a down direction preference relay Y are associated with car A for assisting in controllingV the circuits for the dispatching signals. The relays X and Y are operated by the terminal relays of car A.

An auxiliary direction relay Q is associated with car A to assist in controlling the call-above relay BC of car B.

In order that the various circuits for the push buttons, signal devices, control relays, etc. may be connected for operation in accordance with the movements of the cars, each car is provided with a floor selector. The floor selector FS for car A is similar to those usually employed in elevator systems and may be located in any suitable place such as in the penthouse. The floor selector is provided with a plurality of stationary contact segments disposed to be engaged by suitable brushes mounted on a movable arm FSA. The movable arm is operated over the contact segments in accordance with the movements of the car by means of a screw shaft 2|] which is rotated by a reduction gear 2| operated by a shaft 22 connected to the hoisting drum I2. Inasmuch as floor selectors of this type are old and well known in the art, no further description will be given.

The up contact segments c and their brush 30 are used in connecting the up iloor lantern for car A. The contact segments e and their brush 32 are used for cancelling up stop calls registered on the hall door buttons. The contact segments f and brush 42 cancel the down hall calls. The up contact vsegments d and the up brush 3| operated by car A are used for controlling the up portion of the circuit for the callabove relay BC for car B. The down contact segments g and their brush 4| operated by car A are used for controlling the down portion of the circuit for the relay BC for car B. The brushes 3| and 4| should be long enough to bridge the space between adjacent contacts so as to maintain their circuits. Other contact seg ments and brushes may be added as desired for controlling other features of the elevator system.

It is believe-d that the invention will be understood best by an assumed operation of the system illustrated in the drawings.

It will be assumed that the switches I8 (Fig. 3l have been closed thus energizing the control circuit, that both cars are at the lower terminal and that car A preceded car B to the terminal so that car A now has the next signal to leave. Under these conditions the up preference relay X, the lower terminal relay L, the auxiliary direction relay Q, the car selecting relay P, the call above relay C, the next" lamp NL and the door lantern FL for car A are energized ready for operation and also that the up preference relay BX, the lower terminal relay BL, the auxiliary direction relay BQ and the call above relay BC for car B are in an energized condition.

It will be assumed now that a waiting passenger at the third floor presses the down call button fega'ovgese 319W `at thattoor *for a down '-tripi The-temporary operation of Tthe button SDW Yenr-:rgizes Athe down l'call registering `relay 3DR to register r'a vdown st'opucall, 'bythe circuit: f

faction results because the Vcontacts lBP2 and `-P3 in this circuitare open. The opening 'of ythe contacts 3DR-3 ^in thecircuit'o thexcallabove relay C i for car .A deenergizes vthat relay to .reclose .its .hack `contact C'I '.thusenergiz'ing thestart lamp lSL in ,car A .to `indicate to 'the attendant therein that -he slhouldstarthis car ona trip. The .circuit for `the lamp SL extends.:

L+3, Pz 1393, L4BL4, orso, L-a

.The .car v-is nowready .for its up .trip `and lit is assumed that the attendant therein closes Athe doors. The .closing 4of the .doors closes lthe door and safety contacts l5 thereby energizing the door relay K by thefcircuit:

L-l-l, I'5,K, L-'I .The energized .relay'K opens ,its ,contacts KI `and .K2. Theopening .of .the contacts K2 .extingnishes the ,floor lanternlFL for car A at the .lower termi nal. The vopening .of fthe .contacts .KI .deenergizes 'the carslec'ting relay A,P .and the lower terminal relay'L.

Thefdeenergized relayL closesits back ycontacts "LI and ,opens its .front contacts L2, .143, L4 and '115. The lopening of the contacts L2 and .L3 .de- ,energizes theauxiliary directionrrelays Q landBQ .or'zcars Anand B. The ydeenergizationof .therelay BQ oracar y.Brecloses its .back contacts -BQZ and opens ,its frontcontacts BQl thereby `againgnergizing the call above VrelayCcrcar A.

The 4deenergized auxiliary .direction relay Q .oricar Ar-recloses its back contacts Q2 and .Opens fitszfrontgoontacts QI' thereby energizing the call .abovefrelay BC Vof car B by .thecircuit L+3,:Q2 3J -d I` 41, BC, :Ll-4. Theopening-of vthe contacts I ,prevents .car `B, `from ;receiving 4a .starting `sig- .n'al until :a call -is registered behind vcar A.

At this point the attendant on car A star-,ts that car upwardly by rotating the car switch CS in :the counterclockwise direction toenergize .the Vup (direction. switch U Ac y `.the circuit: Ll-il, CS, '48

Returning now tothe -deenergization of therelay P by the action of the door relay K, the relay vIl' closes its back contacts Pel and-P3 and Aopensits ifront contacts P2 and P4. The opening of the .contacts P2 extinguishes .the next @lamp .NL .and .thats/tart lamp SL ,in .car A. rIheclosing ofthe backcontactsP I lenergizes thecanselecting `relay BP fofcar B by thercircuit.:

'L'{i2,.'BKI,.BM, Bhl ,`Pil, BP, fL-'2 The energized relay BP opens its'back contacts 'BPI 'and BPS .and vcloses its front contacts BP2 -andBP4- The closing of the .contacts BP2 energizes'themnext lamp BNLiin car Bthus giving `the attendant'in'that carthe next signalto get v `ready to A'start when he receives. his. starting sigmtl. The circuitfor lampBNL extends:

'floorflamp`fBFL atlthe iicor I'for-car B'byfthe 'circuit .L+4, .Bonino/LBC] BalrBKz 'The lighting fof the floor lantern :for carfBzindicates to Yintending passengers at the lower terminal 2that carlB will be thefnexttoleave.

It will be assumed now Athatcar `Aarrives at the top ooriand the yattendantcenters his car switch for the stopat that door. The attendant also 'opens the hatchwaydoor `(not shown), thus deenergizing the door relay -K 4toclose itsback contact KI. The closing of the contacts KI enyergizes the `terminal .relay T *by the circuit:

L-H, K| ,-44, h6, T, .L-l

rilhe energized top relay 'T opens its contacts LTl thus deenergizing the up 'direotion'relay'Xror car A which thereupon closes its back contacts vXl thus energizing the down directionrelay Yfor car A by the circuit:

4L+1, Ui, Xl., Li, Yinn-.l

The deenergizedup.direction relay X also closes its back contacts X2 thus energizing the auX- iliary direction :relay Q to lclose its down direc. tion contacts QI and 4open its-up contacts Q21'for controlling the circuit of the call above relay BC for car B. The contacts Q2 should be'slow'opem ingtc permit contacts QI to close before Q2 opens lso as to'maintain relay BC energized while the change is made.

As the attendant vin "car A prepares 'to 'start down he closesthe doors k(not shown) 'thereby again `energizing 'the door relay K to `open the circuit to the brush 3.0 ,which would normally extin'guish the floor lanterntnot shown) for the top oor.

fIt will 'be assumed now :that the attendant 1in car Amoves his :car :switch/.CS in a'clockwise di rection thus energizing the r down direction-.switch D tolmove thecar downwardly, by the :circuit:

, through the circuit:

-Also the attendant 'in `'car A yopens the 'hatch- Way door (not shown) thereby opening :the 'contacts I5 and Adeenergizing the door relay K. Car A is now stopped at the third oor with its doors open.

In Athe meantime car B has remained in the lower terminal with'its next lamp 'BNL illuminated toindicate that it will be the `next carto start from the lower terminal. 'Underthese conditions itwill 'be assuinedthat 'a waitingpa'ssenger at the fourth `floor Vl(which isnc'w behind'the direction `of operation of Icar A) pressesthe button "4DW teunporarilythereby energizing the down call registering relay 4DR to register adown Vcall at the fourth-,floor by the circuit:

The energized relay 4DR -fcloses its 'self-'holding contacts 4DR! tand opens its `contacts l4DR-2 and DB3 in the circuits of the call above relays C and BC. The opening of the contacts 4DR3 does not affect the energized call above relay C of car A. However, the opening of the contacts 4DR2 opens the circuit for the relay BC and deenergizes that relay to cause it to close its back contacts BCI thus energizing the start lamp BSL in car B by the circuit:

L-I-, BP2, X4, BCI, BSL, L-Il The energized lamp BSL indicates to the attendant in car B that he is to start on his next trip.

In the meantime it will be assumed that the attendant in car A shuts the door (not shown) at the third door and rotates his car s-witch in clockwise direction thus energizing the door relay K and the down switch D to continue the down trip of that car.

It will be assumed now that the attendant in car B prepares to start his car upwardly by closing his hatchway doors (not shown) thereby energizing the door relay BK by the circuit:

The energized relay BK opens its contacts BKI Returning now to car A, it will be assumed that as this car nears the first floor the car attendant centers the car switch CS thus deenergizing the down direction switch D to stop the car. As the car stops, the attendant opens the hatchway door at the lower floor thus opening the safety contacts I5 and thereby deenergizing the door relay K. The deenergized relay K closes its back contacts KI thereby energizing the car selecting relay P by the circuit:

Inasmuch as the terminal relay L is in parallel with the relay B it is also energized.

'Ihe energized relay P closes its contacts P2 thus energizing the next lamp NL for car A by the circuit:

L-i-3, P2, NL, L-3

The energized relay P also closes its contacts P4 thus energizing the rst floor lantern FL for car A by the circuit:

L+3, FL, P4, cl, su, K2, L-a

The lighted lamp NL informs the attendant in car A that he will be the next to leave on a trip and the intending passengers will understand by the illumination of the floor lamp FL that car A is selected as the next car to go up. The energization of the terminal relay L opens its contacts LI in the circuit of the down direction relay Y which is thereby deenergized to close its 'back contacts YI, thus energizing the up direction relay X by the circuit:

The energized relay X opens its back contacts X2 thus deenergizing the auxiliary direction relay Q which closes its back contacts Q2 and opens its front contacts QI thusenergizing the call above relay BC of car B to open its back contacts BCI to prevent lighting of the start lamp BSL of car B until it has arrived at the lower floor, car A has left and a call has been registered behind car A.

Returning now to car B, it will be assumed that this car has arrived at the top floor, that the car switch BCS has been centered to deenergize the up direction switch BU and that the hatch- Way door (not shown) has been opened thereby deenergizing the door relay BK. The deenergized relay BK and the position of the car at the top floor energizes the top relay BT by the circuit:

L-l-Z, BKI, BM, Bhi, BT, L-2

The energized relay BT opens its back contacts BTI thus deenergizing the up direction relay BX which in turn closes its contacts BXI thus energizing the down direction relay BY for car B by the circuit:

L+2, BUI, BXI, BLI, BY, L z

The deenergization of the relay BX also closes its contact members BX2, thus energizing the auxiliary direction relay BQ by the circuit:

The energized relay BQ opens its front contacts BQI and closes its back contacts BQ2 to maintain energization of the call above relay C oi car A so that if a call is registered back of car B it will give car A a start signal to proceed on a trip to answer the call back of car B. The relay C remains energized during the change in the contacts QI and Q2 because Q2 opens slowly.

It will be assumed now that the attendant in car B shuts the hatchway ydoor (not shown) and rotates the car switch BCS in a clockwise direction thus energizing the down direction switch BP to move the car downwardly. The closing of the door closes the safety contacts BI5 thereby energizing the door relay BK for the down trip and the car starts down.

It will be assumed now that car B approaches the down stop at the fourth floor and in doing so the attendant centers the car switch BCS and stops the car at the fourth oor and also opens the hatchway doors (not shown) at that floor. The opening of the doors deenergizes the door relay BK during the stop at the fourth floor.

As the car B moves down to the fourth floor stop and deenergizes its down direction switch BD it energizes the cancellation coil 4DRN to restore the call registering relay 4DR, to its normal condition by the circuit:

The attendant in car B resumes the down trip by closing the hatchway door and moving the car switch BCS to deenergize the down direction switch BD. As car B arrives at the first fioor, the attendant centers the car switch BCS thus deenergizing the down direction switch BD. As the car stops at the first iloor the attendant o pens the hatchway door of that floor thus opening the contacts BIS to deenergize the door relay BK which closes its back contacts BKZ thus preparing tl'ie brush B30 of car B to energize the iloor lamp BFL whenever the car selecting relay BP for car B is energized (which will not be until car A leaves the first floor). The deenergized door relay K closes its back contact BKI aaeaess thus energizing; the lower terminal relay BL'fhfor.. car Br through the. circuit. Lei-2,. BKI., Bril.,Y Bbl; BL, L-2. The. energized terminal. relay BL opens its contact members BLI thus deenergizing, the down direction` relay BY which in turn.

closes its back. contacts. BYI thus energizing., the. up direction relay BXfor car B. K

Inasmuch as car A now has the next signal bythelighting of its next lamp NL, thecar. B willV remain at the. lower floor. with no'signals in. operatingl condition until'. another call is registered above to give car A a.star.t" signal.

Bythe foregoing assumed operation it. will. be understood that. weV have. provided.` a. dise patching system for a pair off elevator carsv which requires notimingdevice andwhich-per-v mits the cars to remain at` the dispatching oor. until a call forA service. is registered on one:4 o-fy the call buttons. Itr will be. apparent.4 that. the. attendants may accept passengersand leave the: lower terminal any timey they'y desire without causing any complication.. in the dispatching. system. It will also be apparent that as soon.l as a call is registered lfor. aoor behind a-.car already oni a tripv and which. thatv car-. cannot. answer, then a. dispatchingsignal will be. given: to thefcar at the dispatching floor tocause. it. to leave immediately to take. carev of the call. registered behind the'r car. in. operation.

Although we have illustrated. andy described: only one specic'embodiment' of our inventiom.. itis to be understood that. changes therein. and.. modifications thereof may be made. without-departing from thev spirit andscope. oitheinvene tion.. v

We claim as our invention:l

1. An elevator system comprising. a.v plurality of cars serving. aA plurality.` of. landing floor-sincluding a dispatchingl floor, means responsive tof operationlof the cars for. selecting the next car. 40.

to be dispatched from the. dispatching iioon. aA dispatching; signal device for each car, aplu-- rality of up and downv call devices for register-- ing:calls for serviceat the floors. and? means reefA sponsive to operation of. any one: of the call: deY vices for operatingthe dispatchingsignal device-f for: the car at the4 dispatching iloor selected-as thenextv car to leave the'v dispatching. floor toL give it a starting.:` signal.

; 2..In a mechanism.: forgiving signalsto ele.- vatorsv to. start them from v a dispatching; iioor: onf ay trip to answer callsv for service. aj signalling; devicefor each car for advising' the car.` attend'- ant to starty `atrip,. means responsiveto a. car.I being.. positioned at. thel dispatching. floor. for'. partially completing. a circuit: for energizing its@ signal. dev-ice, a. plurality: of: call` devices. for' registering calls for service at the floors, means: responsive t'cy operation. ofi" a'. call registering device for completing said?. partially completed circuit to the'lastnamedisig-nal device, means for preventing the energization of more than one signal device in the event that more than one car is at the dispatching floor, and means responsive to the operation of an additional call registering device for a floor behind the motion of said first named car on its trip for completing the circuit for a second car signal device.

3. In a mechanism for giving signals to elevators to start them from a dispatching floor on a trip to answer calls for service, a signalling device for each car for advising the car attendant to start a trip, means responsive to a car being positioned at the dispatching floor for partially completing a circuit for energizing its signal. devicely aplurality oft callv devices for registering. cailsf for` serviceA at. theA floors,` means responsive to operation of a call registering. device for. completing, said.. partially completedcircuit to lthe-last-named signal device-,1neans-for pre venting. theY energization of-y moreA thanv onef sig.- nal.. device in thel event that moreAA than one car is` at. the; dispatching.. 110011,. meansr responsive. to the operation.. ot an, additional cal1= registering. device forF a.floor behindfthe Inotionof. said first namedcar on its trip for completingtthecircuit forr asecondcarv signal. device, andmeans responsivefto up motionot theiirstmentioned car. for.- preventing. the.` closing of ther signal` device cir-E cuitlfor` the second car. untiLSaidr-stcar starts its down trip.

4. An. elevator systemcomprisingv two: cars serving. a plurality ot floors .including a dispatch ing.: floor, a. next' signal. device for each: car, means. responsive. to4V the. presence. of. one. orv bothl cars4 at. the dispatching. floor for. operating1 the4 next. signal. device of. a. car. at. the` dispatching. floor toindicate.y that itiwill befthe. next car' toA start.a.trip,..a.start signal.. device for each. car...

a plurality of up. and down callfdevicesffor. rege i'steri'ng. calls. for service at-theffloorsameans rer` sponsive; to4 the oper-ation of. any call device. for" operating the.start signal device for. the. car with.` the operat'edfnext signal. device toa giveit asignalfto start omitstrip, and. means responsiveto that carr startinglonits-trip from the'dis-r patching floor, for. preventing operation.: of; thei st'art signal. device von the other.l car. infresponse. t'othe.: operation. ofr acalldevice for a iioor.` ahead ofthe-car on its trip.`

5.. Anelevator.systemcomprising two cars serve* ingvv a. plurality of oors including rif-dispatching..` floor, a oor lantern at the dispatching floor for each car, a next. sig-nal.` dev-ice for. each car, means responsive to the arrivalof. oneor. bothfof the cars at the Idispatching..floor. for operating. they next signal device. andthefloor. lanternzof an car` at the dispatchingA` floor to indicate` that. itwill be the next car to. start onfatrip; ai star-t"y .4 signal. device for each.. car,v a. plurality of. call= devices. for registering... calls. for service ati.` the.l iioors, meansv responsive: to. operationv of a call".A

. device for operating' the start signaldevicev of:

the. car having the operated next signal de` vice to give it a starting.' signal, ai door-oper-w ated means responsivextolclosingthe-door of the car havingthe starting signal for.- extinguishing.:- itsY floor lantern, and meansI responsive.l tow the departure of that-car for restoringitsmstart! sigr nal. device to'normal condition.

6. An elevator system comprisingftwofcars-fserv ing.' at plurality oflandingf floorsincludinga dispatching floor,A a nexti signal.. device.V for each:A car, mea-ns responsive-.to'thefpresence of the cars?v `at the: dispatching. floor-ifm. operating the next signal.' device ofone .ofA they carsito* indicate: that' it will berthenexticar to. starta'.ltrip,.astart signal device for each car, a plurality of up and down call devices for registering calls for service at the floors, means responsive to operation of an up or a down call device for operating the start signal device of the car having its "next signal device operated to give it a starting signal, and means responsive to movement of that car on its .trip for preventing operation of the start signal device of the other car in response to operation of any call device for any floor ahead of the car on its trip.

'7. An elevator system comprising two cars serving a plurality of landing oors including a dispatching oor, a next" signal device for each car, means responsive to the presence of the cars at the dispatching floor for operating the next signal device of,one of the cars to indicate that the operation of a call device for a stop at a floor behind it on its trip to operate the start signal device of the car remaining at the dispatching oor.

8. An elevator dispatching system comprising a pair of cars serving a plurality of landing oors including a dispatching floor, a next signal device for each car, a selecting relay for each car, means responsive to the unoperated condition of the selecting relay of one of the cars and to the position of the other car at the dispatching oor for operating the selecting relay of said other car, means responsive to operation of the selecting relay of a car for operating the "next signal device of that car to give it a next car to leave signal, a dispatching signal device for each car, a plurality of call devices for registering calls for service at the floors, a call-above relay for each car, means responsive to operation of one or more of the call registering devices for operating the call-above relay of the next to start car, and means responsive to operation of the call-above relay of the next to start car for operating the dispatching'signal device of that car to give it a dispatching signal.

9. An elevator dispatching system comprising a pair of cars serving a plurality of landing iloors including a dispatching floor, a next signal device for each car, means responsive to the arrival of the cars at the dispatching floor for operating the next signal device of one of the cars to indicate that it should be the next car to leave the dispatching oor, a plurality of call devices for registering stop calls for the floors, an energized call above circuit for each car, means responsive to operation of a call device for deenergizing the call above circuit of one of the cars, a start" signal device foreach car, and means responsive to the deenergization of the call above circuit of said one of the cars for operating the start" signal device of the car having the operated next signal device to give it a starting signal.

l 10. An elevator dispatching system comprising a pair of cars serving a plurality of landing floors including a dispatching floor, a next signal device for each car, a selecting relay for each car, means responsive to the unoperated condition of the selecting relay of one or the cars and `to the llo position of the other car at the dispatching oor for operating the selecting relay of said other car. means responsive to operation of the selecting relay of a car for operating the next signal device of that car to give it a next car to leave signal, a dispatching signal device for `each car, a plurality of call devices for registering calls for service at the floors, a call-above relay for each car, means responsive to operation of one or more of the call registering devices for operating the call-above relay of the next to start car, and means responsive to operation oi the call-above relayof the next to start car for operating the dispatching signal device of that car to give it a dispatching signal, an up direction and a down direction preference relay for each car for biasing it to continue in the direction in which it starts a trip, a dispatching terminal relay for each car, means responsive to the position of a car at the dispatching floor for operating its dispatching terminal relay, and means responsive to the unoperated condition of a dispatching terminal relay and to the operated condition of the up direction preference relay of a car away from the dispatching floor for preventing operation of the dispatching signal ofthe other car in response to operation of a call device for a oor ahead of the car away.

11. An elevator dispatching system comprising a pair of cars serving a plurality of landing floors including a dispatching oor, a next signal device for each car, a selecting relai for each car, means responsive to the unoperated condition of l l the selecting relay of one of the cars and to the a position of the other car at the dispatching iloor for operating the selecting relay of said other cart means responsive to operation of the selecting relay of a car for operating the next signal device of that car to give it a next to leave signal, a floor lantern for each car, an up direction preference relay for each car to be operated when that car is conditioned for up operation; means responsive to operation of the selecting relay of a car, to the presence of that car at the dispatching oor and to the open position of a door to that car for operating its iloor lantern to indicate to waiting passengers that it will be the next car to leave the dispatching oor; a dispatching signal device for each car, a plurality of call devices for registering calls for service at the floors, a call-above relay for each car, means responsive to operation of one or more of the call registering devices for operating the call-above relay of the car selected to start next, and means responsive to operation of the call-above relay of the car selected to start next for operating its dispatching signal device to give it a dispatching signal.

HAROLD W. WILLIAMS.

MARK L. MOUNT.

ARVID M. NELSON. 

